Crystal structure of methyl 2-hy-droxy-5-[(4-oxo-4,5-di-hydro-1,3-thia-zol-2-yl)amino]benzoate.

The title compound, C11H10N2O4S, crystallized with two independent mol-ecules (A and B) in the asymmetric unit. They differ primarily in the rotational orientation of the five-membered heterocyclic ring. In mol-ecule A this ring is inclined to the benzene ring by 48.17 (8)°, while in mol-ecule B the same dihedral angle is 23.07 (8)°. In each mol-ecule there is an intra-molecular O-H⋯O hydrogen bond involving the adjacent hydroxyl group and the ester carbonyl O atom. In the crystal, the A mol-ecules are linked via pairs of N-H⋯N hydrogen bonds, forming inversion dimers. These dimers are linked to the B mol-ecules via N-H.·O, C-H⋯O and C-H⋯S hydrogen bonds forming corrugated sheets lying parallel to (102).